"Our customers love Instacart because we make it easy to get delivery from their favorite local stores," the San Francisco-based startup said in an online post.

"We're going to use these resources to grow Instacart and to invest in making our product even better." Instacart has been keeping a low profile since its last funding round about three years ago, and faces competition from younger internet-based services offering to deliver purchases from local shops as well as from established titans such as Amazon.

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Instacart, one of the major players in the so-called "on demand" economy, makes money from marking up purchases, delivery fees, and advertising on its platform but is reported to have yet to post a profit. The startup was founded five years ago.